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Following the DRY (Don't Repeat Yourself) principle, Hibernate Validator let's you express your domain constraints once (and only once) and ensure their compliance at various level of your system automatically.

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//$Id: Validator.java 15765 2009-01-09 14:56:30Z hardy.ferentschik $
package org.hibernate.validator;

import java.lang.annotation.Annotation;

/**
 * A constraint validator for a particular annotation
 *
 * @author Gavin King
 */
public interface Validator {
	/**
	 * does the object/element pass the constraints
	 */
	public boolean isValid(Object value);

	/**
	 * Take the annotations values
	 *
	 * @param parameters
	 */
	public void initialize(A parameters);
}